It's a [url='http://www.tunngle.net/forum/='http://www.autoitscript.com/autoit3/index.shtml']AutoIt']='http://www.autoitscript.com/autoit3/index.shtml']AutoIt[/url] error.
Teknogods is using AutoIt? Better you ask in TG forum
Edit
Don't copy dllloader.exe into the gta4 folder!!! Read the TG notes

yes, you are absolutely right .. a few days ago I was facing the same problem and got resolved by the way you have told here. i was also beneficial by articlewritingclicks, that given me lots of information on repairing exe entry point not found error and different other things, you can have a visit as well.